Tempo je rychlé.

Because tempo is a neuter singular noun, and adjectives in Czech have to agree with the noun they describe.

The adjective rychlý changes its ending depending on gender:

• rychlý = masculine
• rychlá = feminine
• rychlé = neuter

So:

• rychlý vlak = a fast train
• rychlá hudba = fast music
• rychlé tempo = fast tempo

In Tempo je rychlé, the adjective is still agreeing with tempo, so it must be rychlé.

A very common clue in Czech is the ending of the noun. Nouns ending in -o are often neuter, and tempo follows that pattern.

So:

• to tempo = that tempo

You can also see the neuter agreement in other words used with it:

• to rychlé tempo
• to tempo je rychlé

Not every noun can be guessed perfectly just from its ending, but -o is a strong sign of neuter gender.

Je means is.

It is the 3rd person singular form of the verb být = to be.

So:

• tempo = tempo
• je = is
• rychlé = fast

Czech usually keeps je in this kind of sentence, unlike some languages where to be can be omitted.

Czech does not have articles like English a/an and the.

So Tempo je rychlé could mean:

• The tempo is fast
• A tempo is fast

In real context, the intended meaning is usually clear. Czech relies on context, word order, and emphasis instead of articles.

Not exactly.

• Tempo je rychlé = The tempo is fast
  This is a full sentence.

• Rychlé tempo = fast tempo
  This is just a noun phrase, not a complete sentence.

So if you want to make a full statement, you need je:

• Tempo je rychlé.

If you are just naming or describing something, you can use:

• rychlé tempo

Yes, Czech word order is more flexible than English, but the most neutral version here is:

• Tempo je rychlé.

You may also see other orders for emphasis or style, but they are less neutral. For example:

• Rychlé je tempo.
• Rychlé tempo je.

These are possible in special contexts, but they sound marked or literary. For everyday use, Tempo je rychlé is the best pattern to learn.

Because this sentence uses the adjective as a predicate, not as a normal modifier inside a noun phrase.

Compare:

• rychlé tempo = fast tempo
  Here the adjective comes before the noun.

• Tempo je rychlé. = The tempo is fast.
  Here the adjective comes after je, because it is part of the predicate.

This works very much like English:

• fast tempo
• The tempo is fast

A simple English-friendly guide would be:

• tempo ≈ TEM-po
• je ≈ yeh
• rychlé ≈ roughly RIKH-lay

A few details:

• j in Czech is pronounced like English y in yes
• ch is a throaty sound, like the ch in Scottish loch or German Bach
• é is a long vowel, so the last syllable is lengthened a bit

The stress in Czech normally falls on the first syllable of each word:

• TEM-po je RYCH-lé

It is a borrowed international word, and it looks very similar to English tempo. Czech uses many such words, especially in music and other technical or international contexts.

Even though it is borrowed, it still behaves like a normal Czech noun in grammar, including having neuter gender and agreeing with adjectives:

• rychlé tempo
• to tempo

You make it negative by changing je to není:

• Tempo není rychlé. = The tempo is not fast.

This is the normal way to negate a sentence with být (to be).

The simplest way is with intonation in speech:

• Tempo je rychlé? = Is the tempo fast?

You can also change the word order:

• Je tempo rychlé?

That version is especially clear in writing and is very common for learners to use first.

Yes. To tempo je rychlé is grammatical.

• to tempo = that tempo / this tempo, depending on context

Adding to makes the noun phrase more specific or points to a particular tempo. Without to, the sentence is more neutral:

• Tempo je rychlé. = Tempo is fast / The tempo is fast.
• To tempo je rychlé. = That tempo is fast.

Yes. Czech adjectives change not only for gender and number, but also for case.

Here, rychlé is in the nominative singular neuter, because it agrees with tempo in a basic X is Y sentence.

You do not need all the forms at once, but here are a few useful examples with tempo:

• rychlé tempo = fast tempo
• bez rychlého tempa = without fast tempo
• k rychlému tempu = toward fast tempo

So the -é ending is just one form of the adjective rychlý.